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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1003a7572578a9b2c309612878f04febda081c8e315ac9a18585f3a14468d955' 
  AND token = 'wni9SCfZxc3nRcUdM1pkDXzOZnYB/vC68HjObSKkrwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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