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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c885e136a2f42df2d3c29766b6d1ad135ec8e5812c4f12cb20163b3bc498bd4' 
  AND token = '0goF6CKv+qP5+XTIikhRIbyigAKNlvu1OTFRoYpdPlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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