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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b09d39959e3f56711f501de4c5507df0312a6fcd61a43a626ec832448b9292' 
  AND token = '11VL4YK73psR0nmIm919I+vxSPLWrROW2x8TMnAe2K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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