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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74966eae98880d4940c9c03d68058e350afe98ba69ecee2279ba502184d5226c' 
  AND token = 'vknitQG9zeBVgeyLoV//HAjt8gpChL7HSoKN4kWYms8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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