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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35abc7e57f26de2f04d4c5a2fbec5b7f6bf31a7398bae5230ca3a2c2154274bc' 
  AND token = 'Q1FmtuvQvdKOMv61Wo6BCKh30obTRKYa02jwikbqozU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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