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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca6d05a36ca2c3d7aaffbf9e393fd0215e5083558a535ab8f06c7c2625cc5dc' 
  AND token = 'YugKL815UAczzgBccLOcacGdmRzpQLSnb4Czxn0FCtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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