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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99819e38d5e6b7fc882fb69813e5e1c37a971ddef4fc25e287afcff0055bdbbc' 
  AND token = '4CSEXGybHH+rcSPiliXfraglfaxJZQH1myNkB0VpcBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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