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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97eaea7a10f9a2ed6906134dc948a0f5c8a0f42ce67a718464cd43b3de1c4035' 
  AND token = 'XRWychxlWY1CEA8Ap7zxGAeLoNreISIDMvo6eY0FRkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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