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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d320da455feb1077a70eac6c21ed822f62014d65f6e11464122e8c0b03ea74d' 
  AND token = 'akgmT7BU87tKe7F3LNcYDNShPl38q9hZ+x0hxSBH2uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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