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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc440d83d56abccccf2f81d6b120b2ec71648763d586e5d10f94678d60dfeeb9' 
  AND token = 'DogeC3SopVL2Iwlxe9EOuhMyMWhvON6AbQOlqHs1g74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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