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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0993a5a0d37ef5213a86ba729bd5a347511480267239e0ead05172a36cee150' 
  AND token = 'hADHZdGitO0Z5TlK0wk6BlnVoT2aC1l5qHW7oB0Nlz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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