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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584f1ba0ec9e9670e729ec6abdabde183f75d64aa4b03bff356b0137c57a22c0' 
  AND token = 'bz746oGdt+v1CDWj1+2hcyECin8UL3TT7AohsEx+1Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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