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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1cf415ec0cd51551def116c386a9a336513e5ddbc325eb827af19a35db0969' 
  AND token = 'NJ59LFi/B3ipdalX5xE8+RDDopb+3bdmcrrhk+/b7D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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