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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900a1582c9a04c7c8f3fd0d5b8927faf4bf858f1849f937531e5a1319630220c' 
  AND token = '5fVB6Xjf264Uv9cZA19lpWBjLgu8mbq+mULGu01QXb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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