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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d67360bb7c487df9fc9f8c1c8bc7ccfa87503b19ac3e5f25a096cf0a6912c2' 
  AND token = 'haZ0W1F4ekHtCI23OB8S6PWMIahXi8tvWibTygSDXdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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