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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76c41a5246ec3cb6da37601f607cb7bd0d7b59b8f39f738ff987f6757011dba' 
  AND token = '1J7WWPNYn93dvvBiaZGUPEi7ae6lb18CLXnlqRHpmHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}