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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef7a1ac20a4685e7ef1d5b87e527972919d7419ed4db73bccbaf43ae433944a' 
  AND token = 'Qd2cnGV2WE19VU9RJsSXwaTQBFVvvCTQ0zdSWaiFLpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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