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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318df4d8b54291a10e5acb53da8782c6936feef1b565edae5c2c50528ca5ea6c' 
  AND token = 'b7NcE01n7S7wr6+PNy1le5zHshlqajOUmckz2dQ3FoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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