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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6120b1ca17d06f962394b59cb80dde3f52fcb1abe234d7a247d865f218c16b19' 
  AND token = 'zjC8tLggcpE6sXo4n70/+N/A2IeXacSFztVSHyk3eLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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