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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e01d48e967027eec0d52eb399ea56c6a802d2a2a977326c0b73ceb9d531514' 
  AND token = 'fFbhaeehjS4fW4RGkDxPoAMQrFGP2F9CHOQnvY3Mu/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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