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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9138240bb3be0edea2cd45d70cba4dc559122cc6e9f0772993a140bf163dcc7' 
  AND token = '7mtuikLoKCQzirPIN7LDSQYMNYSCrOyoNK6Bu9mEqZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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