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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d900b1ee4d5713f733055a6d800a3014591831d44dd2cbb8d0cc90c164f7e7b' 
  AND token = '098qyGisUgPe+gTZ5t7EhFvGIIKq4Eu94NH8q2l/7WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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