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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34832a1d3a6b389e10627219a782526524802bb557bd57fc77e9554a78fb1428' 
  AND token = 'aaB4kAEBflS7uL8r7f3wbdah/QrOk3ere4mD845+Ac0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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