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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b09b98f715eed07f6df51f9711f73757447dc2770244cfac7ddce3074180ee4' 
  AND token = 'vn1/k/GEgPNU7m3fsKgOTakW/0Xk217ZvroMe3MZz3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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