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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10a61d985937b6c14120188cac5b5e6a63e8f6840a93975b009b35e3de679919' 
  AND token = 'adhT7GaRajiz3bKLdKSMyYVl+gyBS/volu1BoVeoIQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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