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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08944d1207be846a532e11b450d6ad7889267d0a92096e9bac899d8b239aec51' 
  AND token = 'Y0JkVAPncqSlTG7zLYqT2q56OMrD1cdiITwsK9LcbuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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