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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaddc533be713a33946281e0acfaffcf5b78db8edfc1e8a6b3573786c2e537ef' 
  AND token = 'pxFXnR/4psV7JhulmaWn7XBU75jZV+GH04f3F1eaCeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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