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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40bc2dea1aa05f7223c8866196928d2a7224ba4b1b7775ec113b04e98569c90e' 
  AND token = 'GvelLTjHJqBSlMpf31F60RLkXKZnbTWoeq1L0X4XbFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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