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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1cb7d5161d6d0072dd7b00c56e20c04ffa46fba3c8d514e51ecf65de6587c5d' 
  AND token = '4tqgCls0+3HvchqOjUiJQXW6Qn5WD6OjjzLDlJpBsao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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