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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08da8f62bf424a827f1c8d7b5c72d7189df568ade9677c2266fff4ec93747788' 
  AND token = 'eiRcJLESsteV0L8bEU7dlBft0asVdUmd02x7nGC27c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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