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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d2c5673eac6c9d26ca018a203d049a66da2bc52b6b8f084a15903e3adc8edb' 
  AND token = 'vaA92ExvnNZoHuVzXhLeeGT2dVCFHJt7zAsDZAh+uOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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