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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f9f02e73545076ff63b364232d8274e53d785bfc51f5939bad5d5cd30653ac' 
  AND token = 'sSqX15WnJBlAgLcgMKaJNhTRAY/hO3r3m2RA87414+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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