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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '501996eb074a2de8de8a3212cd32c8cc26499b1aa9bd9aa88ae90d75ec6d524a' 
  AND token = 'RVrBTUmE1nuyVZRZHS9LiVC31xtI2g293DBFm5EURBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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