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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab6a6b4b9d9593547734701aab1c6cedf32de501427f7cd5427abee5c6bc3e6' 
  AND token = 'Sa+1qeKdsX338PGtFPhEm9Fwl8LwcPSOvzum4PmY9x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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