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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afeee0c46154789ebb03c15100484e664fa1480718cbab5d277b5243f7c2db4c' 
  AND token = '5mXQWihN4MDTiGdGrFw2Dtn24EXrdDWbSewe5tKjCJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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