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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84286b92098e7264771d786a527362119c9ec5a9673b136639fd5771c0738e1e' 
  AND token = 'rnDNukTA6aprsTs7Tx01ulBkBJPo4Attty119Ogn7+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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