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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1207a751dbe6cd9ded3fb34d81b609320bde35c55600b0fbe14bbc58bac905' 
  AND token = 'NHY/LwjvssKYVUxwb4h3Z42w7y6kimDNIzSF8bCZ0Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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