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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fcca159e70ba23565ec6f2e8b1adaa584a246a14bb59277a27bb4be3cf119a' 
  AND token = 'ctqg7pXhtbbflkSlQ4pAZwMV4USD+vfHIqukQPTjlyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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