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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb7875557621cb69de810f1d4962d13b8c9e9f3d190e07d02df2c3b08b6fe0c' 
  AND token = 'ldvdEYklQ65/wc618C2XntR+QgKe27uiv3f8jlnt5bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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