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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a3beed14390afa7cfac3d691851b508dff3c9cf83f20d2ed3d0bd95642ff1b' 
  AND token = 'ECrZ70+urjN268nh4thC7kYLeVzCiBl3wFC0gu/yDBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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