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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dbb862a9ba0b9836adf625d01461745b132bba8c547788ed2816f8b9a363b79' 
  AND token = 'LF5eyGmSprspNa0ySeK4Sj+Hmbx+5c2x6Z60gBnXm7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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