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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d72c94ff71ffa019b47bd1eaf96e4f97586904f51cca79de1ef569323c89aa' 
  AND token = '11ysAVqEhbsY1ja+0yluTOhKXPBXRbebQSZroQQbxOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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