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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e602b68913b57a668175e555ec3709b55bee4f2115c7ae3c27389ede7a7c3e4' 
  AND token = 'Lvek1gr4awK2oaNjE3Syj6jBkwp0OPzQiuModl5Hgh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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