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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2bfc0eed5322e9c5446570886fe429b21bdcb98c505d2def8a35eff05f10a67' 
  AND token = 'GWR6W20KA7JPlcbGahrMb7fPwBQh7pFfPvObdetPkOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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