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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc8956a319e237a9b0522d3be3bd54a3fcf909b9ba1fd8f9fd8d41a7fe59dfb' 
  AND token = 'pvj0M1gMd5jbo9O+2iCrpYBC9hZLZafhT0HYkwSl50Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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