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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '664e8f0dfe577725240e7b07f9ac2586610ca4ac4f967365ec01084745f57146' 
  AND token = 'O/Bn4eUDY1GnGp85VVdALlQG7Eu8GsKj95/aLy0+fCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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