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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658c8c9d879712de72c4b3f2e6204ef7d9b2177e4987b6e829776d0ffa74a2e6' 
  AND token = 'gkxxBoWTCPpuTO7D09oVL00VsqtNvxmKBNBWqDKZacY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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