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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e975e8ca506c98412fc3a861ced0399e8924e96fc21d5b61958c39b10018e17' 
  AND token = 'ncCFe9fyVcjXSHb2nFhAkd1uJsMSpXmN8w47MVi9iag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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