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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8914542d395b7fab35f99234512b631be0224b5f3bd739ceea15072b3022a6bb' 
  AND token = '8GDLC07hcHXu4mrLAyxOaC2YXyokS79bbv3MFFMrC+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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