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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383195a11e196325615585ce95f464a17577625caa5aa16368f2a61fb73ac622' 
  AND token = 'dJiclHa/frTKTWyTL2DRmP3lFHM3cqvwi7ZRrqtAzsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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