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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a249ee70f1463bb6d072d3d18ab4e84d167e760b4bc4ab99ea98f12517d9b0' 
  AND token = '0C8K3LaVPAcQKsDeYDHBe07g0/kWzcMIWuBwjMJG04w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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