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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb6c8a5ad18657b09f0683a2ad6c95681a0b72c8d97841dfb60ed60f494219f' 
  AND token = 'DTznj8vUBTlQ9+k1tbm+xwkRinRbmrLpUslod978H4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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