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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ae45d06b98df87879b362129b717f17ad6bddc09d503855161ecf9a3a45d70e' 
  AND token = '02HZl5PyccGaWl2qkDUjO+kTcx96UM2LAsqE+VA/8Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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