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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8666bd853d333729bc26ba82cf54ba97e9f0950cf5f2237f29ef677dd720596a' 
  AND token = 'ZxvNFYXKcsTjmDX1Cnxno6tUXPxQkAK0r0LGTQVXyIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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