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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e330a6783f8ae6a702b8ebf22c47443317043417ef3820fdd53b316d2feef6b' 
  AND token = '3+dF+jpfycekrZllGE5Rz71uyApzEq1jTN18/cyyFoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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