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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61201487099189da338e40d3f6fa5270e39addf0c6f6716d66ff50968a5f8fe' 
  AND token = 'tCdrTI8r7iOOub1vkJ60MbS13hTM/DQm1N7QJASweAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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