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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af012ac33e8e214aa9d6fb1274c2649b860e97e46bb161e38615bfa6a3da478b' 
  AND token = 'GCzqFT1O0AQQqM+QEE9eupetKVpn7Fv8owCsL4enpos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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