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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '312f15f6074991153f507cd6fffb59d6d2a3b53f59e175e004de040ce22385dc' 
  AND token = 'RaxU8uT2gGZUG3PdD8E6zGDd2ETGnDwcMnFQk2w52F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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