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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce92407f16a738e7c55626c8dc4562b14266481e37f2fc31baddf83158a35b83' 
  AND token = 'STb9bP7g6W4kHem/Wdt/WKaoWuKGH/s3VvbruY1cbZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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