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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0536e4c8586681d45ba1ae2444070ef6ccfbb824f84e044eb485da6c80853b00' 
  AND token = 'KIxAjIJN9aGaFm+NG/wShxUOeCE3IOrtjCBCA1v4JoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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