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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e477f21bbadef5b1511bd852404f4f1d6b86d2969a16a3c17861abf6e77d83' 
  AND token = '1q05rpbESXQReq+2xlDrbFnHYuSFd3tsDJhOsPTw2m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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