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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c6092b7a045e1f4e62b456914ec1dcdd87252353fc930f5af9852cfdcb79aaa' 
  AND token = 'hWrreSqdgiC/3ZJDqkySg/vRacbgLIlj2I3E3+h6ARA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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