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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009ae0954fd4fadb7594beef47304e5102fa3e728a9823fc474a6696b0ed7df4' 
  AND token = 'HiH7snDc8IQ77swFB+hPclBRe0AQyQA718PRxKwUI90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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