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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a1e650890b39311f35ca5e5635d0f842e97f300fe58abf62d7b011c7802f19' 
  AND token = 'O4UsURUTobijK3iUXFAdX/Sx/9wKV4gGarEaPSBF41g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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